In this video, Todd Lammle shows you his simple method to subnetting by using what he calls block sizes. Spend some time going through the examples, and follow up by reading his book to really build a strong foundation.
- [Narrator] Let's take a look at an example…using those blocks sizes we just discussed.…If I have a class C here, 192.168.10 is my…class C network address, I'm going to…start subnetting in the fourth octet.…My first subnet is 128, really my binary which…is important but I only have one bit on at an eight.…And the fact is that, that value is 128.…255.255.255.128.…So I take 256 minus 128, it gives me a block size of 128.…
I count in increments of that block size starting at zero.…Remember where the IP subnet zero.…Zero and zero plus 128 is 128.…128 plus 128, so I just keep counting in…that increment, it actually equals 256 which I…can't use that subnet obviously.…So this is my subnet, my first one is zero.…My next subnet is 128.…And if we look, I have one subnet bit,…and two to one equals two subnets.…I have seven host bits left, so two to the…seventh is 128 minus two because for the…network and broadcast address which I can't…use gives me 126 host, two subnets, 126 host.…
Now, how do I get my broadcast address…and why is that important?…
Author
Released
9/30/2016For more information on the CCENT exam, visit Cisco's website.
- Overview of internetworking
- Ethernet
- The TCP/IP networking model
- Easy subnetting
- VLSM
- Managing Cisco IOS
- Managing Cisco networks and devices
- IP routing
- Layer 2 switching
- VLANs and InterVLAN routing
- Security
- Network address translation
- IPv6
Skill Level Intermediate
Duration
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Introduction
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Welcome54s
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The CCNA exam58s
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Lab environment overview1m 3s
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1. Internetworking
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Internetworking devices4m 20s
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2. Ethernet
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Ethernet overview2m 23s
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Ethernet addressing3m 51s
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Ethernet cables4m 55s
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Overview of TCP/IP model2m 40s
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Application/process layer2m 19s
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Internet layer3m 37s
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IP addressing4m 33s
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4. Easy Subnetting
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Subnet basics1m 28s
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Subnet block sizing5m 25s
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Subnet by example5m 6s
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Class B subnetting3m 53s
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5. VLSM, Summarization, and Troubleshooting TCP/IP
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VLSM2m 38s
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VLSM by hand6m 28s
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6. Cisco Internetworking Operating System (IOS)
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Introduction to the IOS CLI3m 55s
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Basic CLI commands5m 23s
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Telnet and SSH5m 4s
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7. Managing a Cisco Internetwork
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Router and switch components2m 27s
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Configure DHCP3m 48s
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8. IP Routing
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Overview of IP routing3m 45s
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The IP routing process3m 50s
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Configure IP routing6m 41s
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Static routing5m 28s
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Default routing5m 36s
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Configure RIPv26m 52s
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Verify RIPv2 routing5m 55s
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9. Layer 2 Switching
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Configure a Catalyst switch7m 33s
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Configure port security5m 5s
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10. VLANs and InterVLAN Routing (IVR)
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Overview of VLANs3m 2s
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Configure VLANs3m 8s
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Configure trunk links5m 15s
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Configure IVR on a router2m 42s
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11. Security
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Introduction to access lists2m 24s
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Configure access lists4m 3s
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12. Network Address Translation (NAT)
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Introduction to NAT2m 18s
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Static NAT2m 53s
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Configure static NAT3m 11s
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Dynamic NAT2m 44s
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Configure dynamic NAT3m 44s
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NAT overload (PAT)3m 56s
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Configure NAT overload5m 26s
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13. IPv6
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Introduction to IPv62m 22s
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Overview of ICMPv62m 55s
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Configure IPv66m 7s
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Conclusion
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Next steps51s
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Video: Subnet by example